An exonic BalI polymorphism and an intronic MspI polymorphism of the dopamine D3 gene were genotyped in 101 Caucasians from the Alsace and in 56 people from the Congo. This is the first study of the BalI polymorphism in sub-Saharan Africa and the first population study of the MspI site. BalI allele 1 was rare in the Congo (0.12) whereas it is the most frequent allele in all studies in Europe and Asia. MspI allele 1 was also significantly less frequent in the Congolese (0.24) than in Caucasians (0.52). D3 gene alleles show different frequencies in sub-Saharan Africa and may be useful for population studies.
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Crocg et al. (1996) studied this question.